Madhumathy posted an Question
July 17, 2020 • 17:22 pm 30 points
  • IIT JAM
  • Chemistry (CY)

Monosaccharides

these are monosaccharides they must follow the rules: 1) in aldolase all the central atoms are asymmetrical (chiral) 2)in ketose except 2nd carbon all molecules are asymmetrical. but it is found to contradict the rules by the structures that I have drawn. is my structure wrong? can you please clarify it to me?

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    Priyanshu kumar

    Dihydroxyketone is optically inactive monosachharides...it has no chiral centres. whereas glyceraldehyde is optically active having one chiral centre and thus two enantiomers are formed for glyceraldehyde but no enantiomers for dihydroxyketone

    eduncle-logo-app

    so the rule d is being violated sir

    eduncle-logo-app

    yes as you see in dihydroxyketone there is plane of symmetry present...so it has no chiral centre and it is optically inactive

    eduncle-logo-app

    thank you so much sir😌

    eduncle-logo-app

    welcome😊

  • Madhumathy

    according to the rule C2,C4,C5 must be asymmetrical. but it is not so. because all of them aren't attached to 4different groups

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